What does it mean to be partakers of Christ?

The concept of being partakers of Christ speaks to the union believers have with Him through faith. In Hebrews, it is stated that we are made partakers if we hold the beginning of our confidence steadfast to the end. This means that Christians not only share in the benefits of Christ's righteousness—His perfect obedience and atonement—but also participate in His life as we endure and remain faithful. It underscores the necessity of enduring in our faith, for our identification as 'they that are Christ's' hinges upon our faithful response to His lordship.